Both the Apple’s App Store as well as the Google Play Store have banned gambling apps from their respective marketplaces for a wide variety of reasons. One of the reasons why these apps were banned has to do with the fact that they often use predatory techniques in an attempt to make users spend more money on the apps, something that leads to a spiral that often ends up with users spending far more money than they are able to afford.
However, in spite of the fact that both of the major app marketplaces have banned gambling content, apps that feature gambling are still able to slip through the cracks. Bookie pay per head reviews and news sites found various chameleon apps in both Google and Apple app marketplaces.
They basically do this by posing as harmless apps that are compliant with the policies that govern these stores, only to revert back to their original form and start offering gambling services to users after they have been installed.